PRE-TUNING CHECK LIST.  STREET TUNING.

o   1.  Check for tight intake and tight exhaust.  [Vacuum leaks and exhaust header leaks].

a. Do that by either smoke check or use shop pressurized air.
b. The tuner might be able to perform this service [for a fee] if you are not equipped. 

 

o   2. Verify fuel pump and fuel pressure is sound and proper.

 

o   3.  Ensure you have fresh O2 sensors

 

o   4.  Install new spark plugs and gap as required for the mods and verify good plug wires.

 

o   5.  Have a list of all of the modifications for your tuner.  Note the mods in detail. 
     Donít forget things like rear gear ratio, tire size, throttle body size, fuel injector data.

 

o   6.  Driveshaft and U-joints in good condition.
 

 

o   7.  Verify spark timing with a timing light.  Take the time to find top dead center and install a timing pointer at the crank damper.   If you donít have the ability to check timing with a timing light because commanded timing jumps around too much then the dyno shop can force your ECM to command a steady timing and they can check. At the very least install the timing pointer and verify TDC.

 

o   8.  Verify battery voltage and good alternator charging.

 

o   9. Tires. Good condition and proper air pressure

 

o   10.  Fresh engine oil change.  Fuel or dirt in the oil is not desired, especially during strip or street or dyno tuning.